}

func run(pass *analysis.Pass) (interface{}, error) {
	if !analysisutil.Imports(pass.Pkg, "time") {
		return nil, nil
	}

	checkDeferCall := func(node ast.Node) bool {
		switch v := node.(type) {
		case *ast.CallExpr:
			if analysisutil.IsFunctionNamed(typeutil.StaticCallee(pass.TypesInfo, v), "time", "Since") {
				pass.Reportf(v.Pos(), "call to time.Since is not deferred")
			}
		case *ast.FuncLit:
			return false // prune
		}

		// match since that is how f(x) and f(x...) are different.
		// Check them here but fall through for the remaining fields.
		p := pattern.Interface().(*ast.CallExpr)
		v := val.Interface().(*ast.CallExpr)
		if p.Ellipsis.IsValid() != v.Ellipsis.IsValid() {
			return false
		}
	}

	p := reflect.Indirect(pattern)
	v := reflect.Indirect(val)
	if !p.IsValid() || !v.IsValid() {

	cancelvars := make(map[*types.Var]ast.Node)

	// TODO(adonovan): opt: refactor to make a single pass
	// over the AST using inspect.WithStack and node types
	// {FuncDecl,FuncLit,CallExpr,SelectorExpr}.

	// Find the set of cancel vars to analyze.
	stack := make([]ast.Node, 0, 32)
	ast.Inspect(node, func(n ast.Node) bool {
		switch n.(type) {
		case *ast.FuncLit:
			if len(stack) > 0 {

// a go or defer statement; that is, whether it's a regular function
// call without arguments or results.
func validGoDeferCall(call ir.Node) bool {
	if call, ok := call.(*ir.CallExpr); ok && call.Op() == ir.OCALLFUNC && len(call.KeepAlive) == 0 {
		sig := call.Fun.Type()
		return sig.NumParams()+sig.NumResults() == 0
	}
	return false
}

// walkGoDefer walks an OGO or ODEFER node.

func TestErrorCalls(t *testing.T) {
	files, err := pkgFiles(".")
	if err != nil {
		t.Fatal(err)
	}

	for _, file := range files {
		syntax.Inspect(file, func(n syntax.Node) bool {
			call, _ := n.(*syntax.CallExpr)
			if call == nil {
				return true
			}
			selx, _ := call.Fun.(*syntax.SelectorExpr)
			if selx == nil {
				return true
			}
			if !(isName(selx.X, "check") && isName(selx.Sel, "errorf")) {

			m = n.X
		case *TypeSwitchGuard:
			if n.Lhs != nil {
				m = n.Lhs
				continue
			}
			m = n.X
		case *Operation:
			if n.Y != nil {
				m = n.X
				continue
			}
			return n.Pos()
		case *CallExpr:
			m = n.Fun
		case *ListExpr:
			if len(n.ElemList) > 0 {
				m = n.ElemList[0]
				continue
			}
			return n.Pos()
		// types
		// case *ArrayType:
		// case *SliceType:
		// case *DotsType:

	case ir.OPRINT, ir.OPRINTLN:
		return walkPrint(n.(*ir.CallExpr), init)

	case ir.OPANIC:
		n := n.(*ir.UnaryExpr)
		return mkcall("gopanic", nil, init, n.X)

	case ir.ORECOVERFP:
		return walkRecoverFP(n.(*ir.CallExpr), init)

	case ir.OCFUNC:
		return n

	case ir.OCALLINTER, ir.OCALLFUNC:
		n := n.(*ir.CallExpr)
		return walkCall(n, init)

	case ir.OAS, ir.OASOP:

}

// AppendElemRType asserts that n is an "append" operation, and
// returns an expression that yields the *runtime._type value
// representing the result slice type's element type.
func AppendElemRType(pos src.XPos, n *ir.CallExpr) ir.Node {
	assertOp(n, ir.OAPPEND)
	if hasRType(n, n.RType, "RType") {
		return n.RType
	}
	return sliceElemRType(pos, n.Type())
}

// CompareRType asserts that n is a comparison (== or !=) operation

		case *ir.BinaryExpr:
			n.X = o.expr(n.X, nil)
			n.Y = o.expr(n.Y, nil)
		case *ir.MakeExpr:
			n.Len = o.expr(n.Len, nil)
			n.Cap = o.expr(n.Cap, nil)
		case *ir.CallExpr:
			o.exprList(n.Args)
		}
		return
	}

	n := nn.(*ir.CallExpr)
	typecheck.AssertFixedCall(n)

	if ir.IsFuncPCIntrinsic(n) && ir.IsIfaceOfFunc(n.Args[0]) != nil {
		// For internal/abi.FuncPCABIxxx(fn), if fn is a defined function,

		Lparen token.Pos // position of "("
		Type   Expr      // asserted type; nil means type switch X.(type)
		Rparen token.Pos // position of ")"
	}

	// A CallExpr node represents an expression followed by an argument list.
	CallExpr struct {
		Fun      Expr      // function expression
		Lparen   token.Pos // position of "("
		Args     []Expr    // function arguments; or nil